:TRACe Subsystem

Use the TRACe subsystem commands in TDR/TDT Mode to create traces for displaying T-domain parameters and S-parameters. This includes specifying the waveform content window in which to display the trace. Traces can be displayed in Oscilloscope, Eye/Mask, and TDR modes. Up to 128 traces can be defined. Click here to learn important information about content windows and window axis scaling.

Waveform data for T-domain parameters and S-parameters are written in traces, which are then displayed in and scaled to waveform content windows. Use the :TRACe subsystem for tasks such as:

• Creating a trace
• Assigning a T-domain parameters and S-parameter to the trace
• Selecting a color for the displayed trace
• Displaying the trace

Trace Position and Scaling

A trace's X and Y-axis position and scaling is linked to and set from the :GRAPh subsystem. The only exception is for T-domain parameters (shown in Time-Ohms, Time-Volts, and Time-% content windows). On these traces, the X-axis (time) position and scaling is linked to and set from the :TIMebase subsystem. In other words, the time settings on all time-domain windows are set and controled from the :TIMebase subsystem. For that reason, you can only query X and Y-axis position and scaling in the :TRACe subsystem.

Window Legend

Each waveform content window includes a legend which identifies the trace as shown in this picture. Up to 128 traces can be defined. To show or hide the legend use the following commands:

• :DISPlay:WINDow:TDLegend command for time-domain content windows (Time-Ohms, Time-Volts, and Time-%)
• :DISPlay:WINDow:FDLegend command for frequency-domain content windows (Freq-Mag, GrpDelay, and Phase)

Example 1

The following sequence of commands shows how to create 6 traces to display a T-domain parameter (T11) and an S-parameter (S11), each in three different content windows.

// Create Trace 1 (T11)
:TRACe1:DUT DUT1  //  Select DUT number 1.
:TRACe1:PARameter T1_1  //  Select T11 response.
:TRACe1:OPERator OHMS  //  Display in Time-Ohms content window.
:TRACe1:COLor TCOLor1  //  Select color.
:TRACe1:DISPlay ON  //  Display response.// Create Trace 2 (T11)
:TRACe2:DUT DUT1
:TRACe2:PARameter T1_1
:TRACe2:OPERator VOLTs  //  Display in Time-Volts content window.
:TRACe2:COLor TCOLor2
:TRACe2:DISPlay ON

// Create Trace 3 (T11)
:TRACe3:DUT DUT1
:TRACe3:PARameter T1_1
:TRACe3:OPERator PERCent  //  Display in Time-% content window.
:TRACe3:COLor TCOLor3
:TRACe3:DISPlay ON

// Create Trace 4 (S11)
:TRACe4:DUT DUT1
:TRACe4:PARameter S1_1
:TRACe4:OPERator MAGNitude  //  Display in Freq-Mag content window.
:TRACe4:COLor TCOLor4
:TRACe4:DISPlay ON

// Create Trace 5 (S11)
:TRACe5:DUT DUT1
:TRACe5:PARameter S1_1
:TRACe5:OPERator PHASe  //  Display in Phase content window.
:TRACe5:COLor TCOLor5
:TRACe5:DISPlay ON

// Create Trace 6 (S11)
:TRACe6:DUT DUT1
:TRACe6:PARameter S1_1
:TRACe6:OPERator GDELay  //  Display in GrpDelay content window.
:TRACe6:COLor TCOLor6
:TRACe6:DISPlay ON

Example 2

To place markers on T-domain and S-parameter traces, identify the trace in the :MARKer subsystem by trace number. For example,:

:TRACe3:PARameter T2_1
:TRACe3:OPERator OHMS
:TRACe3:CWINdow TOHMs2
:TRACe3:DISPlay ON
:MARKer:X1:SOURce TRACe3
:MARKer:X1:STATe MANual  //  Turn on marker
…